Summary: The world-wide transportation, space heating and electric generating installations currently in use will continue to produce new CO2 (greenhouse gas) emissions for decades, adding to global warming. Imagine that as of today we abruptly cease to manufacture new cars, planes, furnaces and air conditioning, and stop commissioning new electric power plants. Even so, existing facilities and apparatuses, given their expected service times, would add sufficient new CO2 to the atmosphere that the global mean temperature would likely rise about another 0.6 deg C (1.1 deg F) from today’s level by 50 years from now. In actual fact, however, addition of new fossil fuel-burning facilities will not cease, and indeed will greatly expand, making global warming even worse. Accordingly it is imperative to transform the world’s energy economy to one that relies mainly on alternative and sustainable energy sources and on devices adapted to use them.